/*
- * Copyright (c) 2007-2011 Apple Inc. All rights reserved.
+ * Copyright (c) 2007-2020 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <net/if.h>
#include <net/pfvar.h>
-#if INET6
#include <netinet/ip6.h>
#include <netinet6/in6_var.h>
-#endif /* INET6 */
-#define DPFPRINTF(format, x...) \
- if (pf_status.debug >= PF_DEBUG_NOISY) \
- printf(format, ##x)
+#define DPFPRINTF(format, x...) \
+ if (pf_status.debug >= PF_DEBUG_NOISY) \
+ printf(format, ##x)
static SLIST_HEAD(pf_osfp_list, pf_os_fingerprint) pf_osfp_list;
static struct pool pf_osfp_entry_pl;
static struct pool pf_osfp_pl;
-static struct pf_os_fingerprint *pf_osfp_find(struct pf_osfp_list *,
+static struct pf_os_fingerprint *pf_osfp_find(struct pf_osfp_list *,
struct pf_os_fingerprint *, u_int8_t);
-static struct pf_os_fingerprint *pf_osfp_find_exact(struct pf_osfp_list *,
+static struct pf_os_fingerprint *pf_osfp_find_exact(struct pf_osfp_list *,
struct pf_os_fingerprint *);
static void pf_osfp_insert(struct pf_osfp_list *, struct pf_os_fingerprint *);
if ((pd->af != PF_INET && pd->af != PF_INET6) ||
pd->proto != IPPROTO_TCP ||
- (tcp->th_off << 2) < (int)sizeof (*tcp))
- return (NULL);
+ (tcp->th_off << 2) < (int)sizeof(*tcp)) {
+ return NULL;
+ }
if (pd->af == PF_INET) {
ip = pbuf->pb_data;
ip6 = pbuf->pb_data;
}
if (!pf_pull_hdr(pbuf, off, hdr, tcp->th_off << 2, NULL, NULL,
- pd->af))
- return (NULL);
+ pd->af)) {
+ return NULL;
+ }
- return (pf_osfp_fingerprint_hdr(ip, ip6, (struct tcphdr *)(void *)hdr));
+ return pf_osfp_fingerprint_hdr(ip, ip6, (struct tcphdr *)(void *)hdr);
}
struct pf_osfp_enlist *
pf_osfp_fingerprint_hdr(const struct ip *ip, const struct ip6_hdr *ip6,
const struct tcphdr *tcp)
{
-#if !INET6
-#pragma unused(ip6)
-#endif /* !INET6 */
struct pf_os_fingerprint fp, *fpresult;
int cnt, optlen = 0;
const u_int8_t *optp;
char srcname[128];
- if ((tcp->th_flags & (TH_SYN|TH_ACK)) != TH_SYN)
- return (NULL);
+ if ((tcp->th_flags & (TH_SYN | TH_ACK)) != TH_SYN) {
+ return NULL;
+ }
if (ip) {
- if ((ip->ip_off & htons(IP_OFFMASK)) != 0)
- return (NULL);
+ if ((ip->ip_off & htons(IP_OFFMASK)) != 0) {
+ return NULL;
+ }
}
- memset(&fp, 0, sizeof (fp));
+ memset(&fp, 0, sizeof(fp));
if (ip) {
fp.fp_psize = ntohs(ip->ip_len);
fp.fp_ttl = ip->ip_ttl;
- if (ip->ip_off & htons(IP_DF))
+ if (ip->ip_off & htons(IP_DF)) {
fp.fp_flags |= PF_OSFP_DF;
+ }
(void) inet_ntop(AF_INET, &ip->ip_src, srcname,
- (socklen_t)sizeof (srcname));
- }
-#if INET6
- else if (ip6) {
+ (socklen_t)sizeof(srcname));
+ } else if (ip6) {
/* jumbo payload? */
- fp.fp_psize = sizeof (struct ip6_hdr) + ntohs(ip6->ip6_plen);
+ fp.fp_psize = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
fp.fp_ttl = ip6->ip6_hlim;
fp.fp_flags |= PF_OSFP_DF;
fp.fp_flags |= PF_OSFP_INET6;
(void) inet_ntop(AF_INET6, &ip6->ip6_src, srcname,
- (socklen_t)sizeof (srcname));
+ (socklen_t)sizeof(srcname));
+ } else {
+ return NULL;
}
-#endif
- else
- return (NULL);
fp.fp_wsize = ntohs(tcp->th_win);
- cnt = (tcp->th_off << 2) - sizeof (*tcp);
- optp = (const u_int8_t *)((const char *)tcp + sizeof (*tcp));
+ cnt = (tcp->th_off << 2) - sizeof(*tcp);
+ optp = (const u_int8_t *)((const char *)tcp + sizeof(*tcp));
for (; cnt > 0; cnt -= optlen, optp += optlen) {
- if (*optp == TCPOPT_EOL)
+ if (*optp == TCPOPT_EOL) {
break;
+ }
fp.fp_optcnt++;
if (*optp == TCPOPT_NOP) {
PF_OSFP_TCPOPT_NOP;
optlen = 1;
} else {
- if (cnt < 2)
- return (NULL);
+ if (cnt < 2) {
+ return NULL;
+ }
optlen = optp[1];
- if (optlen > cnt || optlen < 2)
- return (NULL);
+ if (optlen > cnt || optlen < 2) {
+ return NULL;
+ }
switch (*optp) {
case TCPOPT_MAXSEG:
- if (optlen >= TCPOLEN_MAXSEG)
+ if (optlen >= TCPOLEN_MAXSEG) {
memcpy(&fp.fp_mss, &optp[2],
- sizeof (fp.fp_mss));
+ sizeof(fp.fp_mss));
+ }
fp.fp_tcpopts = (fp.fp_tcpopts <<
- PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_MSS;
+ PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_MSS;
#if BYTE_ORDER != BIG_ENDIAN
NTOHS(fp.fp_mss);
#endif
break;
case TCPOPT_WINDOW:
- if (optlen >= TCPOLEN_WINDOW)
+ if (optlen >= TCPOLEN_WINDOW) {
memcpy(&fp.fp_wscale, &optp[2],
- sizeof (fp.fp_wscale));
-#if BYTE_ORDER != BIG_ENDIAN
- NTOHS(fp.fp_wscale);
-#endif
+ sizeof(fp.fp_wscale));
+ }
fp.fp_tcpopts = (fp.fp_tcpopts <<
- PF_OSFP_TCPOPT_BITS) |
+ PF_OSFP_TCPOPT_BITS) |
PF_OSFP_TCPOPT_WSCALE;
break;
case TCPOPT_SACK_PERMITTED:
fp.fp_tcpopts = (fp.fp_tcpopts <<
- PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_SACK;
+ PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_SACK;
break;
case TCPOPT_TIMESTAMP:
if (optlen >= TCPOLEN_TIMESTAMP) {
u_int32_t ts;
- memcpy(&ts, &optp[2], sizeof (ts));
- if (ts == 0)
+ memcpy(&ts, &optp[2], sizeof(ts));
+ if (ts == 0) {
fp.fp_flags |= PF_OSFP_TS0;
-
+ }
}
fp.fp_tcpopts = (fp.fp_tcpopts <<
- PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_TS;
+ PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_TS;
break;
default:
- return (NULL);
+ return NULL;
}
}
- optlen = MAX(optlen, 1); /* paranoia */
+ optlen = MAX(optlen, 1); /* paranoia */
}
DPFPRINTF("fingerprinted %s:%d %d:%d:%d:%d:%llx (%d) "
fp.fp_wscale);
if ((fpresult = pf_osfp_find(&pf_osfp_list, &fp,
- PF_OSFP_MAXTTL_OFFSET)))
- return (&fpresult->fp_oses);
- return (NULL);
+ PF_OSFP_MAXTTL_OFFSET))) {
+ return &fpresult->fp_oses;
+ }
+ return NULL;
}
/* Match a fingerprint ID against a list of OSes */
int os_class, os_version, os_subtype;
int en_class, en_version, en_subtype;
- if (os == PF_OSFP_ANY)
- return (1);
+ if (os == PF_OSFP_ANY) {
+ return 1;
+ }
if (list == NULL) {
DPFPRINTF("osfp no match against %x\n", os);
- return (os == PF_OSFP_UNKNOWN);
+ return os == PF_OSFP_UNKNOWN;
}
PF_OSFP_UNPACK(os, os_class, os_version, os_subtype);
SLIST_FOREACH(entry, list, fp_entry) {
DPFPRINTF("osfp matched %s %s %s %x==%x\n",
entry->fp_class_nm, entry->fp_version_nm,
entry->fp_subtype_nm, os, entry->fp_os);
- return (1);
+ return 1;
}
}
DPFPRINTF("fingerprint 0x%x didn't match\n", os);
- return (0);
+ return 0;
}
/* Initialize the OS fingerprint system */
void
pf_osfp_initialize(void)
{
- pool_init(&pf_osfp_entry_pl, sizeof (struct pf_osfp_entry), 0, 0, 0,
+ pool_init(&pf_osfp_entry_pl, sizeof(struct pf_osfp_entry), 0, 0, 0,
"pfosfpen", NULL);
- pool_init(&pf_osfp_pl, sizeof (struct pf_os_fingerprint), 0, 0, 0,
+ pool_init(&pf_osfp_pl, sizeof(struct pf_os_fingerprint), 0, 0, 0,
"pfosfp", NULL);
SLIST_INIT(&pf_osfp_list);
}
struct pf_os_fingerprint *fp, fpadd;
struct pf_osfp_entry *entry, *uentry;
- memset(&fpadd, 0, sizeof (fpadd));
+ memset(&fpadd, 0, sizeof(fpadd));
fpadd.fp_tcpopts = fpioc->fp_tcpopts;
fpadd.fp_wsize = fpioc->fp_wsize;
fpadd.fp_psize = fpioc->fp_psize;
uentry = &fpioc->fp_os;
uentry->fp_entry.sle_next = NULL;
- uentry->fp_class_nm[sizeof (uentry->fp_class_nm) - 1] = '\0';
- uentry->fp_version_nm[sizeof (uentry->fp_version_nm) - 1] = '\0';
- uentry->fp_subtype_nm[sizeof (uentry->fp_subtype_nm) - 1] = '\0';
+ uentry->fp_class_nm[sizeof(uentry->fp_class_nm) - 1] = '\0';
+ uentry->fp_version_nm[sizeof(uentry->fp_version_nm) - 1] = '\0';
+ uentry->fp_subtype_nm[sizeof(uentry->fp_subtype_nm) - 1] = '\0';
DPFPRINTF("adding osfp %s %s %s = %s%d:%d:%d:%s%d:0x%llx %d "
"(TS=%s,M=%s%d,W=%s%d) %x\n",
if ((fp = pf_osfp_find_exact(&pf_osfp_list, &fpadd))) {
SLIST_FOREACH(entry, &fp->fp_oses, fp_entry) {
- if (PF_OSFP_ENTRY_EQ(entry, &fpioc->fp_os))
- return (EEXIST);
+ if (PF_OSFP_ENTRY_EQ(entry, &fpioc->fp_os)) {
+ return EEXIST;
+ }
+ }
+ if ((entry = pool_get(&pf_osfp_entry_pl, PR_WAITOK)) == NULL) {
+ return ENOMEM;
}
- if ((entry = pool_get(&pf_osfp_entry_pl, PR_WAITOK)) == NULL)
- return (ENOMEM);
} else {
- if ((fp = pool_get(&pf_osfp_pl, PR_WAITOK)) == NULL)
- return (ENOMEM);
- memset(fp, 0, sizeof (*fp));
+ if ((fp = pool_get(&pf_osfp_pl, PR_WAITOK)) == NULL) {
+ return ENOMEM;
+ }
+ memset(fp, 0, sizeof(*fp));
fp->fp_tcpopts = fpioc->fp_tcpopts;
fp->fp_wsize = fpioc->fp_wsize;
fp->fp_psize = fpioc->fp_psize;
SLIST_INIT(&fp->fp_oses);
if ((entry = pool_get(&pf_osfp_entry_pl, PR_WAITOK)) == NULL) {
pool_put(&pf_osfp_pl, fp);
- return (ENOMEM);
+ return ENOMEM;
}
pf_osfp_insert(&pf_osfp_list, fp);
}
- memcpy(entry, &fpioc->fp_os, sizeof (*entry));
+ memcpy(entry, &fpioc->fp_os, sizeof(*entry));
/* Make sure the strings are NUL terminated */
- entry->fp_class_nm[sizeof (entry->fp_class_nm)-1] = '\0';
- entry->fp_version_nm[sizeof (entry->fp_version_nm)-1] = '\0';
- entry->fp_subtype_nm[sizeof (entry->fp_subtype_nm)-1] = '\0';
+ entry->fp_class_nm[sizeof(entry->fp_class_nm) - 1] = '\0';
+ entry->fp_version_nm[sizeof(entry->fp_version_nm) - 1] = '\0';
+ entry->fp_subtype_nm[sizeof(entry->fp_subtype_nm) - 1] = '\0';
SLIST_INSERT_HEAD(&fp->fp_oses, entry, fp_entry);
#ifdef PFDEBUG
- if ((fp = pf_osfp_validate()))
+ if ((fp = pf_osfp_validate())) {
printf("Invalid fingerprint list\n");
+ }
#endif /* PFDEBUG */
- return (0);
+ return 0;
}
{
struct pf_os_fingerprint *f;
-#define MATCH_INT(_MOD, _DC, _field) \
- if ((f->fp_flags & _DC) == 0) { \
- if ((f->fp_flags & _MOD) == 0) { \
- if (f->_field != find->_field) \
- continue; \
- } else { \
- if (f->_field == 0 || find->_field % f->_field) \
- continue; \
- } \
+#define MATCH_INT(_MOD, _DC, _field) \
+ if ((f->fp_flags & _DC) == 0) { \
+ if ((f->fp_flags & _MOD) == 0) { \
+ if (f->_field != find->_field) \
+ continue; \
+ } else { \
+ if (f->_field == 0 || find->_field % f->_field) \
+ continue; \
+ } \
}
SLIST_FOREACH(f, list, fp_next) {
f->fp_optcnt != find->fp_optcnt ||
f->fp_ttl < find->fp_ttl ||
f->fp_ttl - find->fp_ttl > ttldiff ||
- (f->fp_flags & (PF_OSFP_DF|PF_OSFP_TS0)) !=
- (find->fp_flags & (PF_OSFP_DF|PF_OSFP_TS0)))
+ (f->fp_flags & (PF_OSFP_DF | PF_OSFP_TS0)) !=
+ (find->fp_flags & (PF_OSFP_DF | PF_OSFP_TS0))) {
continue;
+ }
MATCH_INT(PF_OSFP_PSIZE_MOD, PF_OSFP_PSIZE_DC, fp_psize)
MATCH_INT(PF_OSFP_MSS_MOD, PF_OSFP_MSS_DC, fp_mss)
MATCH_INT(PF_OSFP_WSCALE_MOD, PF_OSFP_WSCALE_DC, fp_wscale)
if ((f->fp_flags & PF_OSFP_WSIZE_DC) == 0) {
if (f->fp_flags & PF_OSFP_WSIZE_MSS) {
- if (find->fp_mss == 0)
+ if (find->fp_mss == 0) {
continue;
+ }
/*
* Some "smart" NAT devices and DSL routers will tweak the MSS size and
* will set it to whatever is suitable for the link type.
*/
-#define SMART_MSS 1460
+#define SMART_MSS 1460
if ((find->fp_wsize % find->fp_mss ||
find->fp_wsize / find->fp_mss !=
f->fp_wsize) &&
(find->fp_wsize % SMART_MSS ||
find->fp_wsize / SMART_MSS !=
- f->fp_wsize))
+ f->fp_wsize)) {
continue;
+ }
} else if (f->fp_flags & PF_OSFP_WSIZE_MTU) {
- if (find->fp_mss == 0)
+ if (find->fp_mss == 0) {
continue;
+ }
-#define MTUOFF (sizeof (struct ip) + sizeof (struct tcphdr))
-#define SMART_MTU (SMART_MSS + MTUOFF)
+#define MTUOFF (sizeof (struct ip) + sizeof (struct tcphdr))
+#define SMART_MTU (SMART_MSS + MTUOFF)
if ((find->fp_wsize % (find->fp_mss + MTUOFF) ||
find->fp_wsize / (find->fp_mss + MTUOFF) !=
f->fp_wsize) &&
(find->fp_wsize % SMART_MTU ||
find->fp_wsize / SMART_MTU !=
- f->fp_wsize))
+ f->fp_wsize)) {
continue;
+ }
} else if (f->fp_flags & PF_OSFP_WSIZE_MOD) {
if (f->fp_wsize == 0 || find->fp_wsize %
- f->fp_wsize)
+ f->fp_wsize) {
continue;
+ }
} else {
- if (f->fp_wsize != find->fp_wsize)
+ if (f->fp_wsize != find->fp_wsize) {
continue;
+ }
}
}
- return (f);
+ return f;
}
- return (NULL);
+ return NULL;
}
/* Find an exact fingerprint in the list */
f->fp_flags == find->fp_flags &&
f->fp_optcnt == find->fp_optcnt &&
f->fp_wscale == find->fp_wscale &&
- f->fp_ttl == find->fp_ttl)
- return (f);
+ f->fp_ttl == find->fp_ttl) {
+ return f;
+ }
}
- return (NULL);
+ return NULL;
}
/* Insert a fingerprint into the list */
/* XXX need to go semi tree based. can key on tcp options */
SLIST_FOREACH(f, list, fp_next)
- prev = f;
- if (prev)
+ prev = f;
+ if (prev) {
SLIST_INSERT_AFTER(prev, ins, fp_next);
- else
+ } else {
SLIST_INSERT_HEAD(list, ins, fp_next);
+ }
}
/* Fill a fingerprint by its number (from an ioctl) */
int i = 0;
- memset(fpioc, 0, sizeof (*fpioc));
+ memset(fpioc, 0, sizeof(*fpioc));
SLIST_FOREACH(fp, &pf_osfp_list, fp_next) {
SLIST_FOREACH(entry, &fp->fp_oses, fp_entry) {
if (i++ == num) {
fpioc->fp_wscale = fp->fp_wscale;
fpioc->fp_getnum = num;
memcpy(&fpioc->fp_os, entry,
- sizeof (fpioc->fp_os));
+ sizeof(fpioc->fp_os));
fpioc->fp_os.fp_entry.sle_next = NULL;
- return (0);
+ return 0;
}
}
}
- return (EBUSY);
+ return EBUSY;
}
struct pf_os_fingerprint *f, *f2, find;
SLIST_FOREACH(f, &pf_osfp_list, fp_next) {
- memcpy(&find, f, sizeof (find));
+ memcpy(&find, f, sizeof(find));
/* We do a few MSS/th_win percolations to make things unique */
- if (find.fp_mss == 0)
+ if (find.fp_mss == 0) {
find.fp_mss = 128;
- if (f->fp_flags & PF_OSFP_WSIZE_MSS)
+ }
+ if (f->fp_flags & PF_OSFP_WSIZE_MSS) {
find.fp_wsize *= find.fp_mss;
- else if (f->fp_flags & PF_OSFP_WSIZE_MTU)
+ } else if (f->fp_flags & PF_OSFP_WSIZE_MTU) {
find.fp_wsize *= (find.fp_mss + 40);
- else if (f->fp_flags & PF_OSFP_WSIZE_MOD)
+ } else if (f->fp_flags & PF_OSFP_WSIZE_MOD) {
find.fp_wsize *= 2;
+ }
if (f != (f2 = pf_osfp_find(&pf_osfp_list, &find, 0))) {
- if (f2)
+ if (f2) {
printf("Found \"%s %s %s\" instead of "
"\"%s %s %s\"\n",
SLIST_FIRST(&f2->fp_oses)->fp_class_nm,
SLIST_FIRST(&f->fp_oses)->fp_class_nm,
SLIST_FIRST(&f->fp_oses)->fp_version_nm,
SLIST_FIRST(&f->fp_oses)->fp_subtype_nm);
- else
+ } else {
printf("Couldn't find \"%s %s %s\"\n",
SLIST_FIRST(&f->fp_oses)->fp_class_nm,
SLIST_FIRST(&f->fp_oses)->fp_version_nm,
SLIST_FIRST(&f->fp_oses)->fp_subtype_nm);
- return (f);
+ }
+ return f;
}
}
- return (NULL);
+ return NULL;
}
projects / apple / xnu.git / blobdiff